KR20040021500A - Anilox-roller for flexography - Google Patents

Abstract

PURPOSE: An anilox roller used for a flexography is provided to improve printing quality and to expand lift span of a roller by performing a vacuum nitrocarburizing process to the roller after carrying out a super-finishing process to the roller. CONSTITUTION: An anilox roller(3) includes a body(30) having a predetermined diameter, a rotating shaft(31) for rotating the body(30), and an engraving surface(32). The anilox roller(3) is fabricated by sequentially performing a grinding process by using a grinding tool having a mesh degree over #80, a super finishing process by using a grinding tool having mesh degrees over #200, #320 and #620, an engraving process and a vacuum nitrocarburizing process. The vacuum nitrocarburizing process is carried out under the conditions of 100-400 torr of pressure and 550°C.

Description

Anilox-roller for flexography

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to anilox rollers for flexography. More particularly, the present invention relates to an anilox rollers which are engraved on a surface to supply ink to a typesetting roller in a printing machine. In addition, the present invention relates to an improvement of the anilox roller for the purpose of increasing the surface hardness of the anilox roller to improve the printing quality and to extend the life of the roller.

In general, printing is applied to ink on a certain plate and transfers the ink to another material (usually paper, but cellophane, polyethylene, vinyl, wood, glass, ceramics, aluminum, tin plate, etc.). As a technique of duplicating a large number of backs, the technique of copying and the act of making printed materials are collectively called.

The printing ranges from the printing of the printing plate to the printing of the high speed printing, and the printing of the plate, such as the convex plate, the flat plate, and the concave plate, is increasing in recent years, and the use of plate printing is increasing in recent years. Possible electrostatic printing has been put to practical use, and such printing methods include offset printing, sprin printing, flexo printing, transfer printing, letterpress printing, and electronic printing.

Flexo printing among various printing methods as described above,

In other words, flexography is a type of convex printing through a convex plate, and is a method of printing a liquid ink as a medium by using a flexible printing plate such as elastic resin or rubber.

In order to perform the above-described flexography, a typesetting roller 11 having a printing plate 10 having a thickness of about 5 to 7 mm on its outer circumference, as shown in FIG. 1,

An anilox roller 12 for supplying ink to the printing plate 10 is interposed therebetween and interposed therebetween, and a rubber roller 13 for uniform distribution of ink on the side of the anilox roller 12. ) Is interposed and interposed.

In addition, a guide roller 15 for supporting, supplying and discharging the material 14 is further provided below the typesetting roller 11 on which the printing plate 10 is mounted.

As described above, the anilox roller 12, which supplies ink to the printing plate 10 in flexography, has an engraving surface having a pyramidal shape, a grid shape, a diagonal shape, and the like so that the ink is evenly distributed on the printing plate 10. (16) is formed to prevent agglomeration or smearing of ink in the typesetting roller 11.

In this way, the conventional anilox roller 12 that supplies ink to the printing plate 10 of the typesetting roller 11 is formed through the manufacturing process as shown in FIG. 2.

Grinding process 20 for processing through a grinding device to set the straightness and roundness, including the roller surface having a predetermined diameter,

Engraving process 21 for processing a pattern such as a pyramid, lattice, diagonal, etc. on the ground surface of the roller, and

The roller, which has undergone the grinding 20 and engraving process 21, is manufactured through a plating process 22 for hard metal plating such as chromium to prevent corrosion (rust) of the surface.

As described above, the anilox roller 12 produced through the grinding step 20 → the engraving step 21 → the plating step 22 is formed on the surface by a rubber roller 13 connected laterally as shown in FIG. The ink is uniformly applied to the formed engraving surface 16, and then ink is supplied to the printing plate 10 of the typesetting roller 11 connected directly below and flowed in between the typesetting roller 11 and the guide roller 15. The printed matter of a predetermined form is printed on the material 14.

However, the anilox roller 12 is slid with the rubber roller 13 and the typesetting roller 11 due to excessive surface roughness increase by the plating process 22 performed to prevent corrosion of the engraving surface 16 of the surface. This caused a decrease in print quality reliability due to ink bleeding.

In addition, the part of the engraving surface 16 is blocked through the plating process 22, causing problems in the accurate ink supply to the printing plate 10 of the typesetting roller 11, as well as the problem that the printing surface is blurred, continuous friction By the surface of the anilox roller 12 is easily worn, causing frequent replacement of the anilox roller 12 due to shortened life, there was a problem causing economic losses.

Accordingly, the present invention has been made in order to solve the above problems, performing a super-finishing process in addition to the grinding process in the anilox roller, followed by a engraving process on the roller surface, performing a vacuum nitridation heat treatment process on the roller to corrode It is aimed at improving the printing quality and maximizing the economic profit by extending the life of rollers by increasing the prevention and engraving hardness.

1 is a simplified configuration diagram showing a state of use of the anilox roller for a general flexography for explaining the present invention,

2 is a block diagram showing a manufacturing process of the anilox roller for flexography to which the prior art is applied;

3 is a perspective view showing an anilox roller for flexography to which the technique of the present invention is applied;

4 is a block diagram showing a manufacturing process of the anilox roller for flexography to which the technique of the present invention is applied.

* Description of the symbols used in the main parts of the drawings *

3; anilox roller

30; roller body

31; roller axis of rotation

40; grinding process

41; Super Finishing Process

42; engraving process

43; vacuum nitriding heat treatment process

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

3 is a perspective view showing an anilox roller for flexography to which the technique of the present invention is applied, and FIG. 4 is a block diagram showing a manufacturing process of the anilox roller for flexography to which the technique of the present invention is applied.

Anilox roller 3 for flexography according to the present invention for achieving the above object;

As shown in FIG. 3, a main body 30 having a predetermined diameter and a rotation shaft 31 serving as a supporting point during rotation are interposed at both edges of the main body 30 in the axial direction, and a cross section of the main body 30 is pyramidal in shape. Including lattice and diagonal engraving surface 32 is formed.

As described above, the anilox roller 3 used in flexography is produced through the following manufacturing processes.

Grinding process (40) to have a measurement value of 0.02 straightness and 0.02 roundness using a grinding mechanism having a mesh of # 80 or more to improve the accuracy of printing on the roller body of a predetermined standard (Φ260 * 2600L or more; 30) ),

In order to give the grounded roller body 30 with improved precision, a super finishing process of having a measured value of straightness 0.002 and roundness 0.01 through a grinding mechanism having a mesh of # 200, # 320, # 620 or more ( 41),

Engraving process 42 which gives the surface of the roller body 30 which passed through the grinding process 40 and the super finishing process 41, the engraving surface 32 which has a lattice-shaped and diagonal cross section, including a pyramid shape,

As described above, the anilox roller 3 having the engraving surface 32 formed on the surface of the main body 30 through the engraving process 42 controls and adds oxygen within 2% to a mixed gas of ammonia and methane in the vacuum furnace. And a vacuum nitrocarburizing process 43 for forming a surface hardness of 65 to 70 HRC under a pressure of 100 to 400 torr and a temperature of 550 ° C. for 20 hours.

In general, heat treatment is applied directly to the material, so that it causes heat deformation,

Vacuum nitridation heat treatment carried out in the present anynox roller (3) can minimize or minimize the deformation of the material by performing a heat treatment with a mixed gas in a vacuum state, the surface straightness and roundness of the material as in the present invention This process is suitable for surface hardening of anilox roller.

As described above, the anilox roller 3 generated through each process is connected to the rubber roller 13, the typesetting roller 11, and the like, as shown in FIG. 1, and the injected ink is engraved through the engraving surface 32. It is supplied to the printing plate 10 in a uniform and stable state to enable a smooth printing operation.

In addition, the anilox roller 3 of the present invention manufactured by vacuum nitriding heat treatment eliminates the plating process performed to prevent rust occurring on the surface, thereby solving problems such as ink bleeding caused by fragmentation by plating. Clear print quality can be obtained.

In addition, the vacuum nitriding heat treatment performed on the anilox roller (3) increases the hardness of the engraving surface to suppress the wear of the anilox roller (3) continuously friction with the rubber roller (13) and the typesetting roller (11) Compared with the conventional non-heat treated anilox roller, it can achieve a significant life extension.

As described above, the anilox roller for flexography according to the present invention increases the surface hardness by vacuum nitriding heat treatment, thereby significantly reducing wear due to friction, thereby prolonging the service life of the anilox roller, and thus, the replacement cycle of the anilox roller. Extension to maximize economic profit generation.

In addition, it is a useful invention that the engraving surface is excluded from clogging due to foreign substances such as plating material to improve the printing quality according to the uniform and stable supply of ink, and furthermore, it is possible to produce environmentally friendly parts by eliminating the plating process.

Claims (1)

A main body 30 having a predetermined diameter and a rotating shaft 31 serving as a supporting point when rotating on both axial edges of the main body 30 are interposed therebetween, and the surface of the main body 30 includes a pyramid-shaped cross section and a lattice type and In constructing the anilox roller for flexography in which the diagonal engraving surface 32 was formed; The anilox roller 3, Grinding process (40) for processing to achieve a straightness of 0.02, roundness of 0.02 using a grinding mechanism having a mesh of # 80 or more, Super finishing process (41) for processing to achieve a straightness 0.002, roundness 0.01 by a grinding mechanism having a mesh of # 200, # 320, # 620 or more, Engraving process 42 to provide a engraving surface 32 by selectively processing one of the grid, diagonal, including pyramid on the surface of the main body 30, The surface is subjected to a vacuum nitrocarburizing process (43) in which a controlled addition of oxygen of less than 2% is carried out to a mixed gas of ammonia and methane in a vacuum furnace and maintained for 20 hours under a pressure of 100 to 400 torr and 550 ° C. Anilox roller for flexography, characterized in that to achieve a hardness of 65-70HRC.